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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1ef273b7ac605ebdaca87b75f948c609dec610e1b5375f8cb7441a53830ed46' 
  AND token = '6J/tM/inXFe56j2ZaKvw3/Z+wiv3wRjTLZuckPsp344=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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