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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a3ad7f0921c54636d4a8c92b7a0ba08793003b852e522127b00414ad5d88592' 
  AND token = 'UzZBI0ljiglimTjPdQBqjR2cGEcivgxOaMnX+IIClr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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