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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dd93ba3dac060c10812fcecd2e5b9b0526a659b16752613a030d4e8c1278e89' 
  AND token = 'Az7O0cxkzUrgb5ARfz7gt+uDC0dUhZd30gnvEYCkJw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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