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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee2686b9581c30c2a2d182186f16f4dcee168ca69e51ba5cfa2af53a0c60a31f' 
  AND token = 'RUW46P219ySuYdvxeuko1h/yUJP7/yqXe47wbdVsU44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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