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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '173e22dbe48263d4d3fd083129ff08bb99dfb0683914335fc04bc3fe960ef528' 
  AND token = 'Skq8cDbdBVehdeG3HVPvkK1NuAbWUi1j5HDdf+I61Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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