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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '475fd2abc258898723f0284d80ca498964037a1ce009f550fed44fc615a0c4a8' 
  AND token = 'o0l/EqmAuxdmIf70+peGJBkVoIhMA4mQwUdl+Q5nYHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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