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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9d595b617bdf76ed56f2991f7dafc5bcb71ca2e863d286b30c6bdb6ec39a632' 
  AND token = 'r0erMbr9REYLFDThuE9J4GWDuKkiE/eN51ZoiMUdN64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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