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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '138f644bfe5b9dec48e49e147836bd220dee69139ef84fdbd57a5b40c6e9e461' 
  AND token = '4Rxr3EltzrR7xvIJostzgAvK4U0KCe36IB7hJihLOUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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