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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d3b385d30296b4cc822dd1f92f441780258b0646bf20ed389848f363dbd4352' 
  AND token = 'MEPQ9vaz0f0XXc1ZiCErvF/6gxAIatCgSeGr1PdeRtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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