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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dcce3f137453ca29633dfc5b04464c20e3c50bd0f9ee692dd21c46cec5a9ace' 
  AND token = '/Z0Fot4LI9JYhLaIjkQmPBzMIxyRrl3yJ8QnL3ggo+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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