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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06ff47aaa2cf8f8436de8a8cb64ec19c5e96803252d6d08590c9aa72425c56d0' 
  AND token = 'YYHHWVbQxcTyOfenzuMNqOMaHjeH+6mFbU9CkEaAKJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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