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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b76731382a928d57b63748a14ff77761a02664db8726808cc1476b18322045c5' 
  AND token = 'j5fXUvMAgUHB3B/0Oh38zmEakcr/g4r452rqC5+IPEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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