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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfc66dbbba2dc9940f2f37de3377116db26d6889a5477772b73714200ba84fb2' 
  AND token = '6xUJlAeDrl/zmFHsnzVaBxcw1B5eal6c9CemzYyBJ1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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