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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33f38c40fe4350a6e31d7af4a2656cc657dc782982b10c3d9f678bca901d9280' 
  AND token = '3joUMtli0guVDj6hLJ8ELBlpc0jgON3RTs+OZi13Kjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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