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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f10cecd0b17906f96582b974a54add9ce67ba7939f97f1c3066fc4f5ce7144f3' 
  AND token = 'LKVcKnTiUfD/3AiS1gonZi8iX/bm99xFNS1bYGoWOKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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