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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57062115ddaf5064db4a75a4a8c7611bf4cfd5fc373796e7627849b251ea674e' 
  AND token = 'F11fhWQUHgvknIvfHaq76OqwZP4BaGEq4wm8D5QROqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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