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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '683f58c8765f718bdeea1be22ed09f4b07190f98d889c38d203f4b090e97430e' 
  AND token = 'VZDdAamUDNuhgTC/EbKqM0wi1NN8V4Ewlctw7f+WmXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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