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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a06ec942f9b9bdc149e412fab2a67c5b88acf9d1f6288b886a988d74092e9738' 
  AND token = '7rAgGwQRKfTo7lyRRUMP6fUEnQFqDVDnZRlF/NveSwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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