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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dbb9a405db08d83d1718d163fbac61cbc2c3afbc8e855f5cd59fc588dca14fd' 
  AND token = '4jK777k3ZTKD+W1fJo3frPEiTKnqVsU2/Niisf0vTlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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