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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b286e77d87d60c85a72ee742c4129d5afe065d7b48189fc734b1b87e3ab408da' 
  AND token = '3EVVp9BTOrDmZWtwi4Xz75RUBYHDf8k2NfjrxKzeqpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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