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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bce9dedd381775cc0584dff41d5cbc0e9f0c8986341cbe5dd16cb59d6629813b' 
  AND token = 'KkfKQv8RCgvLNRu/d6xFWmjKTg2K1RBjdZxU/a7ZOTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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