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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26d3c3e256d1373a755252c50e32a06b98de2733dd103c437f2b660cf185b522' 
  AND token = 'hfbbaKdnov9Opit+kJ7/iB/T/Xisx95u/dqh8Vd3qxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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