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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5847c4d40d7f6f016b9a0ca2bfaf73522d54ab3f3b1b8a84987ebeadd8ca52ff' 
  AND token = 'Us/hW2fKP364lQHf9ylLqDr+NdBtOK/qY3192JNuyqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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