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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8df8decbb32c34d94480e0cec1535e993dfccc3293b6263ea6814e27c9a37c08' 
  AND token = 'WwkoDgIHm8YjBnR6ZpqRNf+FK2yokKQ5iJah4c//kM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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