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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9883ebaffc61e2af6d19d713d12df2c24a83c48b25dd9e04dac0a23bb91589dd' 
  AND token = 'GsfgKv4ub/pFAONxr46VxgVVOdoBYtf6S93afofjvUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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