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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb0d6cc78c96afe74d726dc2138f0959607a86bcab59851f67eb3a3a175a7495' 
  AND token = '97ZWZyp1e9oFId33CcOj7al5Bh8J349hL/MqHnBZmps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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