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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0974900b3d5517334c7edf8ca1b86198bfb9ec8300642d674064cb2d4184db0' 
  AND token = 'eDlZEZKgw8/M4OMqL86bdTtxZGuW2JIbRiq4ayddCLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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