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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ec06f141a348ab4796a6aa2389e3ae310e0b5ed49c6a01e25f9879e9f22ca1e' 
  AND token = 'FDTP+FiZkry1iuKzkKm4KogfO2QRHprFbKCnOjNuWmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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