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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dcae849f6dc01ce43d4b6dc922d41bfce477c9c41a167b14ed790fc2902680e' 
  AND token = '+3cyf2t0mHePLkr8iTz6XWNU5Ht0zAlv7YsLHWX8pB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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