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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5084bc704b9ac815a786256c237e569424fe7dde7f050b7e90330c0ddae89dc5' 
  AND token = 'AcM2CvgL84gQIs7FCMPdrwp/xCrZOaXqB1Th3n6Dq4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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