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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c0eb97e32a053d1c3c3e516355a5c231214ea075a5c35f66b8ed80b3cfcb7eb' 
  AND token = 'UGALMUFTGvLyVUXL1JnasBoq7y7SX6onJDxECvmnbfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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