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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2dbbf7812f451b85794849a594d90b75a97a6717b531d36b935c357116ad100' 
  AND token = '7jH5EvCWlTzyZjZuJRBQOLvzyu9caN1wPn0mxCI748w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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