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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31f58ca6c782bedb06ed33d3e52f0f3b0b3c4e7d8b34819c9b550d4f0fc95c72' 
  AND token = 'JgNTBeWiEGtEyrboMBmRyQuOqV7HPhaKGeLuo/Z93dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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