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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb268b1129a42eaa4556598b45e6ffabc4ac6a1b364e73f9cc703ea591f07c3d' 
  AND token = '/iOi21caZtTJ8/90aKiU82J3QtgE2P345EJY+WXt1xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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