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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3133b2bb47cb4d3a2f18fd7674f3a78f3dae4adf013ca0393b3de45dc9ef3c72' 
  AND token = 'zIGhgpthY5zEljpCtW3xxvj2U6ta4Tc4DXz91ijtnfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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