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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20a35bf75bc3e5207e5af72a28c5c5a69465455286d5cd74d0200176d5f7d60f' 
  AND token = 'I/jcHHZ60liHc5Dot4GLxi4pXIsP1i3UN4xT9pjlMz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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