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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdfc0592882a7364226e323435a1335fedad326cca094b5246af3e88330f84c4' 
  AND token = '2HVdXAy/8n2+d+AFs1R3REstu4D6RSSvdEfkv2UwVGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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