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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd681307ad67e58399b6d6d48d26aff6a2be7e4f431f0a4873af3b09b096a4ebf' 
  AND token = 'vP/YEsO8HWlMdV0MQxOfyTbKkRwBNrl69O1wVM9WBuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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