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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e26dcd23b4df80894c0a173f86fa373084ff8d8f551833cbc0dbaddd6222553' 
  AND token = 'i9GbcUwzmP4fPrqZeQ/9qLNS0rk5Asif8I2OgeXTeI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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