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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1020f71e9ba0f1a51b00881ab97b749cb4f8efdb3fb7c19e543e9492a3e7d2d3' 
  AND token = 'LlFtkRY45I2opWD4Bo5Raa7lYlKMklT5LUAYCmEvKjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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