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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '705a53c907b244307a5574598378dc1ee528134299fc4e450dcd2d3f67518eb1' 
  AND token = 'vDaegyfD+mL9cFiWBE8nt4Y6xHQDfMqa0c8CZ0FTpRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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