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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfa5ccca6b0d2a35e5f88c05405d2a16fcaae628721dd28a37f38bcbd52c5ff5' 
  AND token = 'XL8xRX415EkteUEzeNIF8AdSSo+xAtKU+GCVvdP33Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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