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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4314ed654c8ee7f3dd01d2aa302e73c28787f57f960f07e5c195d3327333c456' 
  AND token = 'DF2gH6BbhaoZC/UzQQeP83e5oEEZbRV/GzAnRJ5blnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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