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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f7960b54f118e99aac1db11abe73615f6f326862afb964de7a3c309a6f319e1' 
  AND token = 'IHIUCiNqU1xB4DAUe03TRz+yax1l5rtjFPshdOA6jBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}