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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9571b0bc11be429e8ee7e2a504acb7027e8f6f498c851b63d4f84eb8a290dcb' 
  AND token = 'bqyqRe2YFt8QrPJZBnV/hezxuELY1tEYsZV6Sf20wC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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