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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be6bcf8c570242773f9f60a4fed5cbab2a2c83a7f268f8a21d219fb5919506e8' 
  AND token = '3zK3Yr17OLBSpXcoLC+MrrlH6k7v1fe4xln7O0DDzRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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