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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03e8fa69928b1357f213765a045a771dea6b4fb30dc2cb3971e3411955564e7c' 
  AND token = 'WPEtxgZ9RupKDBtm359tcufItnrlnbsXCpJ6Omfa0sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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