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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aca0e523c16b321bdbdf81317c8d5a98f154ad721a441216aa3fe094f357961d' 
  AND token = '2MxgzIOSurNlo/8Gt+J9R/BUcEnt9IiDH+MkeL4EmrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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