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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28d327106839858e100dc68b34099827e00bbe4253b8d896f62fb0406dcf7c0e' 
  AND token = 'gbRQud83P6QrvCl7XTiovlSmadkQm6In6UgCPzOJbp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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