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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f21d759efd519b689bbc12daf5026d564e4f3a4592b33ede4112e18d4b3acfc' 
  AND token = 'rBDLajGt8OdXKskFSbmtuCMRfp76B8YXn94/EAms3t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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