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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54ee4c72c098ab7baa0208700e27ed0f8a366aa0f84ef954622c005eaa7d4031' 
  AND token = 'cdKHJX/QlsRtc3MCIeOrKCDEYPY50EnHlwHZ4b77L2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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