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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dcb97165a55446458d12b32adcd3a8b011c05ff2a6016f8147a084a68df65e8' 
  AND token = 'fA/E/M3isWKSjBl49UZSRf42/fO31Vx3iKrFB8JzpBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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