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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69f41ebae212db4a14bbd09aa679b77389cf81280a2e61bb88a9c0160d6d3c2e' 
  AND token = '6ms4DKf2qO36NqkHHZPgAeEjIcSpjdjwpGLuLX4gojo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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