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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fc52f4168a9c9f5f9b295caea720dd59fbbdb83d23597002fd3ed23936e8c58' 
  AND token = 'G4hs2kaiQgOA6clTKWM80pgQ3fKM9GMIVVQM910KUKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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