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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62b76228f8e1b5601c783e6208c72e7dc09227759226f131286055cdd1b94944' 
  AND token = 'Bp+gT/uKg2xKJHmjb6EFEdbdAWx4x/iwJKcNCQzTl/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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