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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aec8fb6230d5bdfd2d0867ee9fb078ee17b3ce465db6322d7ae0dea740c522c' 
  AND token = '0mftbaZGnPCp7fMKsU69zkUudEUM5Yli2rY+FTae+hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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