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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb65e65eb2a6fedf78fa845bf1b5c71bf910f8e3c8c94f8805f669015213b4b6' 
  AND token = 'cbWrOlnSwHAwJrNiBBAVPLn846hXGBxA/KCyJkeupjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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