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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b6740dadc2ef80ea7b71028a7e9a698f9ed821fdfb2a92e86956a1ddfea2871' 
  AND token = 'dxzy93G/d9TXGcfSsMpygkh6OSP2aYR1Q/IMz/9UZDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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