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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08583034234ed1c88f83499a4cc874b3d7959860a6d77a4b06f7c678c91f2c68' 
  AND token = '1M5N51ryBNZbTeW3L0HDBqyOC7bwCjGzbg+Arz7Ai14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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