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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3219b48fab5270443f4f45a78ce2a5cc0b2f48e7eb4ec7f506d1623bddf60232' 
  AND token = 'tOLfdwz3/dybb96s/F4REkwarNSiOm1W5CZECq+38xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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