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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '668893873defcf0e12d63f16f976a64e8352cbd98f45b9408c91701c81cfb44a' 
  AND token = '2yonsgWUzDOes59R8rTTHeu/hrIl1bxrROhU2zB+9VI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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