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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ef38c5e8bde4220a17b942488d45929ae3ec44fadef8622ca60efcd1879fe47' 
  AND token = 'UAiga8FiWlQCw7Wwq2zrNgwP/sVjtKK28A6FtY98UyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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