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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6468d28dc23b37ea74a01eb722bf659684299f95d2055a91584f0d1eaada2937' 
  AND token = 'yiXLCKaRlTCZKecMjJBSE0uL25AgJN4fQPzCu1dTUYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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