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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e12c14f9339cae66aed5602bc17d37437b2591a18e9d735b23af907d93644e8' 
  AND token = 'UboyOohCuNZdtetp6Hpt/muT295M5lz/szWcJ4fpPpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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