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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c34a0409b5f2f652ecbde9b72541b731bac81f53ce485e612f0e7705dbbc94cd' 
  AND token = 'MUIWjS2R80nFZDv1f3Kjtwj9gwo+zSI7I589Hy895Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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