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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '130260fe485fac094826023c3adb86d6b9ef20e8894379990e065b32d2a5a270' 
  AND token = '/plt6if0OiYygHI0KqXa9LSJLxkV9iUma3B+2IrbtMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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