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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecd7358b15f3065b8007a6323cc1ad34627ae00b0e205847f55b9239148864ce' 
  AND token = '8qbURiE+uWIf8RTUJ64H9qUPOOD0Tby+dXcPaNdZKJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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